This sentence comes from the Tang Dynasty poet Yuan Zhen's "Five Songs of Separation, the Fourth": Among thousands of people, you meet the person you meet. In thousands of years, in the boundless wilderness of time, you are neither a step earlier nor a step later. When you meet, you can only say softly,"Oh, are you here too?" In novels, this sentence was often used to describe the scene of two people meeting in the vast sea of people, expressing a wonderful feeling of fate.